Not a bad one for sure.Some guys I know block the trailer frame so it takes the pressure off the springs/torsion axles too. Just don't ever do it if you happen to transport the trailer on some sort of a flat bed. As the vibration going down the road kills the bearings with no load/pressure on them.

I just put my trailer on blocks to get my tires off the ground. Is that a good idea for storing for the winter?

Yes....my dads boat sits on a sideways slope ove the winter...and it warped the tires one yr and we discovered it by having them blow out on the way to Austin one yr...he now blocks it up and he hasnthad any problems